Climate averages 1991–2020
Spokane weather
in September.
A warm, fairly dry month: the 4th warmest and the 3rd driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Spokane: daytime highs average 23.7°C and nights cool to about 11.0°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 19 mm of rain on roughly 4 days, which makes September a fairly dry month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 38 min on an average September day.
The nearest other city in this atlas is Spokane Valley (14 km away). In September its highs average 23.2°C, 0.5°C cooler than Spokane, with 22 mm of rain.
Among the 498 cities listed in the United States, Spokane ranks joint 374th of 498 for the warmest September highs and 118th of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; Spokane is 3.2°C cooler than that mean.
From September to October, average highs fall by 8.6°C to 15.1°C, and monthly rainfall rises from 19 mm to 46 mm.
The annual picture
September in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Spokane climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 2.2°C-4.6°C | -4.6°C | 69 | 12.7 | 8.99 h |
| February | 5.0°C-3.6°C | -3.6°C | 49 | 10.0 | 10.210 h |
| March | 9.7°C-0.6°C | -0.6°C | 63 | 12.0 | 11.912 h |
| April | 14.3°C3.0°C | 3.0°C | 50 | 9.8 | 13.614 h |
| May | 19.9°C7.8°C | 7.8°C | 46 | 8.0 | 15.115 h |
| June | 23.8°C11.6°C | 11.6°C | 33 | 6.0 | 15.916 h |
| July | 29.7°C16.0°C | 16.0°C | 13 | 2.7 | 15.616 h |
| August | 29.3°C15.7°C | 15.7°C | 12 | 2.3 | 14.314 h |
| September, selected | 23.7°C11.0°C | 11.0°C | 19 | 4.2 | 12.613 h |
| October | 15.1°C4.9°C | 4.9°C | 46 | 7.9 | 10.911 h |
| November | 6.8°C-0.5°C | -0.5°C | 73 | 12.6 | 9.49 h |
| December | 1.9°C-4.1°C | -4.1°C | 78 | 12.3 | 8.59 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Spokane Valley in SeptemberUnited States · 14 kmHigh 23.2°C · Low 10.5°C · 22 mm rain
- Tri-Cities in SeptemberUnited States · 207 kmHigh 27.5°C · Low 14.0°C · 6.9 mm rain
- Kennewick in SeptemberUnited States · 207 kmHigh 27.4°C · Low 13.9°C · 6.9 mm rain
- Yakima in SeptemberUnited States · 261 kmHigh 24.9°C · Low 10.7°C · 8.4 mm rain
- Missoula in SeptemberUnited States · 274 kmHigh 22.5°C · Low 9.8°C · 30 mm rain
- Kelowna in SeptemberCanada · 290 kmHigh 22.2°C · Low 12.7°C · 43 mm rain
- Bellevue in SeptemberUnited States · 358 kmHigh 20.7°C · Low 11.3°C · 67 mm rain
- Kirkland in SeptemberUnited States · 358 kmHigh 20.1°C · Low 11.0°C · 71 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Spokane) is explained once on the Spokane year overview and on the Sources, method and limits page.